Using WithApi causes nil pointer

[dhuckins]

the comment // If nil is provided for the tlsConfig value, TLS will be disabled. indicates that passing in a nil tls config is valid but this would result in a pointer exception

hcp-sdk-go/config/with.go

Lines 39 to 52 in f22e799

	// WithAPI credentials is an option that can be used to provide a custom
	// configuration for the API endpoint.
	//
	// If nil is provided for the tlsConfig value, TLS will be disabled.
	//
	// This should only be necessary for development purposes.
	func WithAPI(address string, tlsConfig *tls.Config) HCPConfigOption {
	return func(config *hcpConfig) error {
	config.apiAddress = address
	config.apiTLSConfig = tlsConfig.Clone()
	return nil
	}
	}